Sealing device for collapsible tubes and the like



June 25, 1935- s. DE FAVER! ET AL SEALING DEVICE FOR COLLAPSIBLE TUBESAND THE LIKE Filed Oct. 31, 1934 2Sheets-Sheet l June 25, 1935. s. DEFAVER] 'Er AL 2,005,235

SEALING DEVICE FOR COLLAPSIBLE TUBES AND THE LIKE Filed Oct. 51, 1934 vg Sheets-Sheet 2 Z'mnentor 5: Je iz/er'z' 9 3. 65778172 (IttornegPatented June 25, 1935 "UNITED STATES SEALING DEVICE FOR COLLAPSIBLETUBES AND THE LIKE Serafino De Faveri and Ri ccardo (limatti, London,England, assignors to Monocap Limited,

\ London, England Application" October 31, 1934, Serial No. 750,876 InGreat Britain September 28, 1933 i Y 7 Claims. (Cl. 221-.60

This invention relates to closures for collapsible tubes and othercontainers of the kind having a cap adjustable in position on the neckof the con' tainer, 'an upwardly diminishing extension or portion of theneck of the container, one or more apertures in this upwardlydiminishing part adapted to beclosed by the cap and an orifice in thecap adapted to be closed by the neck of the container. v I

The first object of the invention is to provide an improved closure ofthis kind, which permits of easy ejection of the material with a smalldisplacement of the cap.

A further object of the invention is to enable the cap to serve'as areceptacle or table for holding the ejected material in a convenientposition for removal and use.

The invention is illustrated by way'of example in the accompanyingdrawings, in which:

. Figure 1 is a sectional view of one embodiment of the invention.

Figure 2 is a sectional View of anotherembodiment of the invention. g

Figure 3 shows a tube closure having incompletely perforated deliveryholes in the nozzle and provided with a perforating device.

Figure 4 is a plan View of the said perforating device.

Figure 5 shows a tube nozzle in which a sealing coating is provided overthe delivery holes of the nozzle.- e i M i In the embodiment oftheinvention'illustrated in'Figure 1, of the drawings, the delivery endof the tube I is formed with a hollow nozzle or neck 73 in-the form of atruncated cone having a gradually increasing-taper '3 from its freesmaller endto its base. the nozzle being closed at its outer end andhaving on its incurved conical surface, one or more apertures ororifices 4, through which the substance contained in the tubecan'beej'ected when the latter is squeezed, these apertures or orificesbeing suitably situated between the closed end and the root of thenozzle or neck.

Upon this conical member'is fitted a'removable cap or covert, having acentral perforation B of such size'a'nd shape that its inner wall 1 isalways spaced out of contact with the surface of the nozzle, theperforation 6 terminating at its outer end in a narrow conical ring 8adapted to engage closely and smoothly over the smaller end of thenozzle without biting into the material of the latter. p

The cap 5 has at the wider'end of its perfora tion an internal screwthread adapted to engage with a corresponding external thread at theroot of the nozzle; These (ac-operating screw threads will permit thecap to be screwed down so "that the conical ring 8 in the cap 5 engagesclosely over the end of the nozzle, and seals the delivery aperture orapertures formed in the nozzle, or 5' screwed outwards a suitabledistance so that its internal surface no longer seals the deliveryaperture' or apertures and the contents of the tube can be squeezed out.1

As will be seen fromthe drawing, the incurved conical nozzle is of shortheight in relation to its base diameter and is made withavery sharptaper. This permits the closure to be sealed or opened with a minimumdisplacement of the cap on the nozzle.

"Further, the tapered wall of the nozzle is' made i in the form ofare-entrant curve giving an in: creasing'taper from tip to root and theedge 8 of the ring at the outlet and of the cap-is made conical androunded so as toengage smoothly upon the free end of the cone whenthecap is in the closed position. This construction of thenozzle and ofthe'cap orifice avoids any wedging'action which would be produced it thecone were made straight. By making the wall of the nozzle in the form ofa re-entrant curve, the engagementof the ring 8 upon the nozzle is moresmooth and gradual and in the event of wear a new seating position forthe ring 8 is easily established without biting into the material of thering and with 30 out exerting any bursting action on the cap which mighttend to be produced if the nozzle were made in the form of a straightwide cone.

The curved form 'of-thewallof the nozzle also assists the outward flowof the material when the tube is squeezed and tends todirectthismaterial towards the direction of outlet. This action is furtherfacilitated and increased by the shape of the inner wall I of the capwhich is spaced apart from'the' wall 3 of the nozzle so as to leave achamber in which the material can flow easily towards the outlet of thecontainer.

If the wall 1' of the cap were made to engage closely over the wall 3 ofthe nozzle, a considerable friction would exist at all times which willimpede the free passage of the material. Pref erably, as shown in thedrawings, the inner wall 1. of the cap is made in the form of a curve,of approximately opposite shape to that of the Wall 3 as shown in Figure1.

With such a curvature of the wall 1, the material is still furtherdirected towards the direction of the outlet when the tube is squeezed.

In the embodiment of the invention illustrated in Figure 2, the nozzle 9and its outer surface of the nozzle and the internal surface of the cap.

cup-shaped table H.

. the outlet orifices formed in the nozzle.

, I3 to form a chamber l2 for receiving the material as it is ejectedfrom the tube.

In this embodiment, however, the cap [3 is expanded at its head, whichis dished to form a When the cap is screwed away from the body of thecontainer, the cupped table l4 provides a receptacle into which thematerial ejected from the tube can be received and removed as required.For example in the case of toilet cream or shaving cream, a quantity ofcream may be squeezed out of the tube as required and may be removedfrom the cup after the cap has been screwed down to seal the tube again.

This provides a very clean and convenient way of using the materialsqueezed out of thetube as will readily be appreciated.

In order to provide a perfect seal when the material contained in thetubes has to be stored, the delivery holes in the nozzle may be arrangedto be normally closed. In the example shown in Figure 3,the deliveryholes l5 are incompletely perforated and a ring l6 provided with apiercing point I1 (see Figure 4) is mounted on the tube neck below thecap. .Or as shown in Figure 5, a filmor coatinglB of gelatine or thelike material may be applied over the nozzle so as to Ts gal 1s filmwill be removed by the purchaser in order to liberate the orifices inthe nozzle and permit the contents to be squeezed out of the tube.

In both the embodiments described above, on

account of the fact that the nozzle taper is greater at the base than atthe tip, the material forced through the holes in the nozzle will tendto be directed upwards towards the discharging orifice of'the cap, andthis movement will be assisted by the free space left between the outersurface Moreoventhe narrow sealing ring at the mouth of the cap,provides a quick opening and sealing action when the cap is turned oneway or the other and the conical shape of this ring in conjunction withthe increasing taper of the nozzle,

provides at all times; a perfect seal when the cap is screwed down.

,A'freefiow of material is readily obtained when the capis opened andthe tube is squeezed, and no resistance is experienced as would be thecase if-the nozzle vweremadewith a straight cone and the cap with aco-operating internal straight cone fitting closely over the nozzle inthe closed position.

, 'f 1 Having now described our invention, what we claim as new anddesire to secure by Letters Patent is l. Aclosure for collapsible tubesand other containers of the kind set forth, comprising an apertureddeliverynozzle in theform of a truncated cone of sharp taper and ofsmall depth in propor-, tion to its base diameter, having an incurvedsurface whereby the nozzle is given an increasing taper from tip toroot, and a cap adjustable on this nozzle and terminating at its outerend in a narrow ring having a rounded conical ,edge

adapted to engage closely and smoothly over the smaller end of the saidnozzle.

2. A closure for collapsible tubes and other con- 7 tainers as claimedin claim 1, wherein the inner surface-of thesaid cap is arranged inspaced relationship with the incurved conical surface of the nozzlewhereby an annular chamber is formed between the saidnozzle and the saidcap.

3. A closure for collapsibletubes comprising a screw-threaded neckportion on the tube terminating in atapered delivery nozzle (2) in theform'of a truncated cone of sharp taper and of small depth in proportionto its base diameter, and having an incurved surface (3), whereby thenozzle is given an increasing taper from root to tip, and upwardlyinclined delivery ducts formed substantially in the centre of theincurved wall of the nozzle, a centrally apertured cap adapted to screwon the said neck and terminating at its outer end in a narrow ring (8)having a rounded conical edge adapted to engage closely and smoothlyover the smaller endof the said. nozzle-the inner surface (1) of the capbetween the termination of the thread on the said cap and the saidnarrow ringhaving a smooth surfaceof opposite curvature to that ofthenozzlawhichsur face is so formed as to guide the extruded contents ofthe tube towards the outlet end 'of the cap.

4. A closure for collapsible tubes and other cantainers of the kindset'forth as claimed in claim 3, wherein the delivery ducts in the saidnozzle are normally sealed and have to be freed before any material canbe removedfrom the tube or, other container.

5. Aclosure for collapsible tubes and othercontainers of the kind setforth as claimed in claim 3, wherein the said delivery ducts in thenozzle are sealed during manufacture by coating the said nozzle with alayer of gelatineor like material, which said layer has to be detachedbefore any material can be extruded from the tube or other container. 1I

6. A closure for collapsible tubes and other containers' of the kind setforth, comprising an apertured delivery nozzle in the form of atruncated cone of sharp taper and of small depth in proportion to itsbase diameter, having an incurved surface, whereby the nozzle is givenan increasing taper from root to tip, and a cap adjustable on thisnozzle and having itsinner surface arranged in spaced relationship withthe incurvedv conical surface of the nozzle, whereby an annular chamberis formed between the said nozzle and the said cap, the said capterminating at its outer end in a narrow ring having a rounded conicaledge adapted to engage closely and smoothly over the smaller end of thesaid nozzle and the said containers of the kind set forth, according toclaim 6, wherein the outer endof the cap is dished to form a cup-shapedreceptacle.

, SERAFINO DE FAVERI. RICCARDO CIMA'II'I.

